2013 NATEF Task Area A-2 Automatic Transmission

2013 NATEF Task Area A-2

Automatic Transmission7-2013

• A. General Transmission & Transaxle Diagnosis

• B. Transmission & Transaxle Maintenance & Adjustment

• C. In-Vehicle Transmission & Transaxle Repair

• D. Off-Vehicle Transmission & Transaxle Repair

Typical Rubric for NATEF Competencies

1 = Demonstrated Exposure and has observed the competency

2 = Applies the competency but only mastered a few essential attributes

3 = Capable of the competency but needs further practice

4 = Performs the competency satisfactorily [Proficient]

5 = Mastered the competency [Exemplary]

NATEF Task Area A-2 Automatic Transmission & Transaxle

A. General Transmission & Transaxle Diagnosis

Identify and interpret transmission/transaxle concern, differentiate between

engine performance and transmission/transaxle concerns; determine necessary

action.

A2.A.1

P-1



Research applicable vehicle and service information fluid type, vehicle service

history, service precautions, and technical service bulletins.

A2.A.2

P-1



Diagnose fluid loss and condition concerns; determine necessary action. A2.A.3

P-1



Check fluid level in a transmission or a transaxle equipped with a dip-stick. A2.A.4

P-1



Check fluid level in a transmission or a transaxle not equipped with a dip-stick. A2.A.5

P-1



Perform pressure tests (including transmissions/transaxles equipped with

electronic pressure control); determine necessary action.

A2.A.6

P-1



Diagnose noise and vibration concerns; determine necessary action. A2.A.7

P-2



Perform stall test; determine necessary action. A2.A.8

P-3



Perform lock-up converter system tests; determine necessary action. A2.A.9

P-3



Diagnose transmission/transaxle gear reduction/multiplication concerns using

driving, driven, and held member (power flow) principles.

A2.A.10

P-1


P-1


Diagnose electronic transmission/transaxle control systems using appropriate test

equipment and service information.

A2.A.11



Diagnose pressure concerns in a transmission using hydraulic principles

(Pascal’s Law).

A2.A.12

P-2


P-2

B. In-Vehicle Transmission & Transaxle Repair

Inspect, adjust, and replace external manual valve shift linkage, transmission

range sensor/switch, and park/neutral position switch.

A2.B.1



Inspect for leakage; replace external seals, gaskets, and bushings. A2.B.2

P-2



Inspect, test, adjust, repair, or replace electrical/electronic components and

circuits including computers, solenoids, sensors, relays, terminals, connectors,

switches, and harnesses.

A2.B.3

P-1


Drain and replace fluid and filter(s). A2.B.4


P-1



Inspect powertrain mounts. A2.B.5

P-2


C. Off-Vehicle Transmission & Transaxle Repair

Remove and reinstall transmission/transaxle and torque converter; inspect engine

core plugs, rear crankshaft seal, dowel pins, dowel pin holes, and mating surfaces.

A2.C.1

P-1



Remove and reinstall transaxle and torque converter assembly. “Oldie”



Inspect, leak test, and flush or replace transmission/transaxle oil cooler, lines, and

fittings.

A2.C.2

P-1



Inspect converter flex (drive) plate, converter attaching bolts, converter pilot,

converter pump drive surfaces, converter end play, and crankshaft pilot bore.

A2.C.3

P-2



Describe the operational characteristics of a continuously variable transmission

(CVT).

A2.C.4

P-3



Describe the operational characteristics of a hybrid vehicle drive train. A2.C.5

P-3



Disassemble, clean, and inspect transmission & transaxle.

P-3

A2.C.6



Inspect, measure, clean, and replace valve body (includes surfaces and bores,

springs, valves, sleeves, retainers, brackets, check-balls, screens, spacers, and

gaskets), and torque valve body bolts.

A2.C.7

P-3



Inspect servo bore, piston, seals, pin, spring, and retainers; determine necessary

action.

A2.C.8

P-3



Assemble transmission/transaxle. A2.C.9

P-3



Assemble transmission/transaxle. A2.C.9

P-3



Inspect, measure, and reseal oil pump (F & R) assembly and components. A2.C.10

P-3



Measure endplay or preload; determine necessary action. A2.C.11

P-1



Inspect, measure, and replace thrust washers and bearings. A2.C.12

P-3



Inspect oil delivery circuits, including seal rings, ring grooves, and sealing surface

areas, feed pipes, orifices, and check valves/balls.

A2.C.13

P-3



Inspect bushings; determine necessary action. A2.C.14

P-3



Inspect extension housing, bushings and seals; perform necessary action. “Oldie”



Inspect and measure planetary gear assembly (includes sun, ring gear, thrust

washers, planetary gears. and carrier assembly); determine necessary action.

A2.C.15

P-3



Inspect case bores, passages, bushings, vents, and mating surfaces; determine

necessary action.

A2.C.16

P-3


D. Off-Vehicle Transmission & Transaxle Repair

Inspect, measure, and replace thrust washers and bearings. “Oldie”



Diagnose and inspect transaxle drive, link chains, sprockets, gears, bearings, and

bushings; perform necessary action.

A2.C.17

P-3



Inspect, measure, repair, adjust or replace transaxle final drive components. A2.C.18

P-3



Inspect clutch drum, piston, check-balls, springs, retainers, seals, friction and

pressure plates; determine necessary action.

A2.C.19

P-3



Measure clutch pack clearance; determine necessary action. A2.C.20

P-1



Air test operation of clutch and servo assemblies. A2.C.21

P-1



Inspect roller and sprag clutch, races, rollers, sprags, springs, cages, and

retainers; determine necessary action.

A2.C.22

P-3



Diagnose transmission/transaxle gear reduction/multiplication concerns using

driving, driven, and held member (power flow) principles.

Carrier drives = overdrive

Carrier driven = reduction

Carrier held = reverse

Two members held = direct drive

Nothing driven or held = neutral

Parking Pawl engaged to the output shaft = park

“Oldie”



Diagnose electrical/electronic concerns using principles of electricity (Ohms' Law). “Oldie”



Inspect and reinstall parking pawl, shaft, spring, and retainer; determine

necessary action.

“Oldie”



Inspect bands and drums; determine necessary action. “Oldie”



Inspect accumulator bore, piston, seals, spring, and retainer; determine necessary

action.

“Oldie”



Diagnose mechanical and vacuum control system concerns; determine action. “Oldie”



Inspect, adjust or replace (as applicable) vacuum modulator; inspect and repair or

replace lines and hoses.

“Oldie”



Inspect, repair, and replace governor assembly. “Oldie”



Inspect and replace external seals and gaskets. “Oldie”



Inspect and replace speedometer drive gear, driven gear, vehicle speed sensor

(VSS), and retainers.

“Oldie”



Measure torque converter endplay and check for interference; check stator one-

way clutch.

“Oldie”



Complete work order to include customer information, vehicle identifying

information, verify customer concern, related service history, cause, & correction.

“Oldie”



Locate and interpret vehicle and major component identification numbers (VIN,

vehicle certification labels, calibration decals).

“Oldie”

Documents

2013 NATEF Task Area A-2 Automatic Transmission